gnome-shell crashed with SIGSEGV in meta_background_get_texture()

Seem onnected to nvidia bublebee primus.
syslog said sthbout segfault in mutter
happes after reboot, ut without updates.
purging nvidia drier helped. a bit...
Very strange,

ProblemType: Crash
DistroRelease: Ubuntu 15.04
Package: gnome-shell 3.16.2-0ubuntu1~vivid1 [origin: LP-PPA-gnome3-team-gnome3-staging]
ProcVersionSignature: Ubuntu 3.19.0-18.18-generic 3.19.6
Uname: Linux 3.19.0-18-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.1
Architecture: amd64
CrashCounter: 1
CurrentDesktop: GNOME
Date: Sun Jun 7 11:20:26 2015
DisplayManager:

ExecutablePath: /usr/bin/gnome-shell
GsettingsChanges:

InstallationDate: Installed on 2014-07-08 (333 days ago)
InstallationMedia: Ubuntu-GNOME 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
ProcCmdline: gnome-shell --mode=gdm
ProcEnviron:
 SHELL=/bin/false
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 LANGUAGE=de_DE
SegvAnalysis:
 Segfault happened at: 0x7f9e90688ab2: mov 0x14(%rax),%edx
 PC (0x7f9e90688ab2) ok
 source "0x14(%rax)" (0x00000014) not located in a known VMA region (needed readable region)!
 destination "%edx" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: gnome-shell
StacktraceTop:
 ?? () from /usr/lib/libmutter.so.0
 ?? () from /usr/lib/libmutter.so.0
 meta_init () from /usr/lib/libmutter.so.0
 main ()
Title: gnome-shell crashed with SIGSEGV in meta_init()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: